AEM Ultimate Resource Thread>>>>

[pengulns2001]

that would be my guess i think its the fuel map that the ecu actually sends to the injectors, probably taking into account any trims etc that you have in the map.

[pengulns2001]

nvm thats not it changing throttle inj maps has no affect on the numbers, im still at a loss but dont really care since we cant adjust it anyway

[BAdAzZV8]

hmm, very odd

then why does it have throttle vs rpm? We don't control fuel from that other than the throttle inj map. I don't care either if we can't change it, just curious. Oh well.

[pengulns2001]

yeah but the fuel is exactly the same regardless of throttle position excpet for the area around idle, it could be an idle trim thats changing it the context sensitive help wont spit anything out when you put the mouse over it either and its not listed in the help files or manual

[pengulns2001]

ill go post it in the aem forum maybe we can get a response from a tech over there

[pengulns2001]

oh i guess you beat me to it lol, no suprise no response though give it like a year or so lol

[Heikki]

Guys,

I plan on sharing my maps and all once I get the car to the dyno. But I have a problem getting the car running right and wanted to ask some advice.

I completed AEM EMS installation yesterday with 720cc injectors, 3.5Bar MAP and GM IAT. I set up all sensors correctly, verified timing with a timing light, but the car does not idle right. It starts no problem and the idle is stable, but #1 cylinder is out so it idles like 5 cyl Audi lol.

It seems that injector #1 is not getting the pulse from ECU. I verified that the cylinder gets strong spark, so this is not ignition related. I thought that the injector was bad, so I took out fuel rail out, swapped the injector #1 with #3 and tried again. No change. I hooked up a scope to the injector #1 harness and I saw battery voltage but no pulses. I can see pulses at injector #3 harness. Also if I take the injector harness out or disable injector #1 in EMS software the idle does not miss a beat, so I am quite sure that the this is a fuel issue.

With stock ECU & fuel everything worked great. I was wondering if I should assign a different injector driver for #1 cylinder and hook the wire currently at ECU pin #1 to the other output just to check if the #1 injector driver circuit is bad? Worth trying? Is there anything else that could cause something like this?

I bought my AEM EMS used but it has the latest firmware, and I am running the latest software with v1.11 calibration files.

Heikki

[pengulns2001]

i would do exactly what you suggested, try using a different injector driver from the AEM it sounds hardware related to me, or even try plugging your stock ecu back in and see if the injector fires, the car wont run but you would at least know its the driver, i belive you are using one of my maps correct? if so its definatly not in the map since multiple cars inlcuding my own have run on it just fine

[pengulns2001]

just to double check go to options, full list and make sure 1-6 are all turned on

[pengulns2001]

This map (table) is used for speed-throttle (alpha-n) mode. AEM has this hidden because very few of us run our setups this way. You can add it to your menus by editing them.

The context sensitive help state this:
"Fuel Throttle
Type: Map (17x21)
Units: Fuel vs RPM x Load
Pre v0.96 Name: New in v1.00
Description: Base injection pulse width based on engine RPM and Load when in speed-throttle (alpha-n) mode only"

Generally, Alpha-N systems are typically used in racing applications where the camshaft characteristics preclude speed-density control. Alpha-N control calculates airflow based on throttle angle (the alpha term) and engine RPM (the N term). In addition, most alpha-N systems make a correction based on air temperature. The accuracy of an alpha-N system is highly dependent on consistent throttle body behavior and is adversely affected by any vacuum leaks. Adding closed loop feedback from a wideband exhaust gas oxygen sensor greatly improves the accuracy of an alpha-N system. The major advantage is that alpha-N control has no dependence on manifold pressure and is able to tolerate radical camshaft profiles.